Headset Microphone not working

I have a Creative Fatal1ty Gaming Headset , the audio work's but I cannot get the mic to work.

I have a Creative soundblaster 5.1 live soundcard and a abit fatal1ty fp-in9 sli m/b.
Audio works on both soundcard and on-board sound on the m/b , but not the mic .... I know some basics to computer's but I'm stuck here.